热力历史对PMMA残余应力和光学性能的影响  

Influence of Thermal-Mechanical History on Residual Stress and Optical Properties of PMMA

作　　者：王韬[1,2] 葛勇[1,2] 郎建林[1,2] 孙琦伟[1,2] 厉蕾[1,2] 颜悦[1,2] Wang Tao;Ge Yong;Lang Jianlin;Sun Qiwei;Li Lei;Yan Yue(AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;Beijing Engineering Research Centre of Advanced Structural Transparencies for the Modern Traffic System, Beijing 100095, China)

机构地区：[1]中国航发北京航空材料研究院,北京100095 [2]北京市先进运载系统结构透明件工程技术中心,北京100095

出　　处：《工程塑料应用》2017年第8期60-64,共5页Engineering Plastics Application

摘　　要：利用光弹测量对注射成型过程不同热力历史的聚甲基丙烯酸甲酯(PMMA)样件进行了残余应力的定量表征,并测试分析了样件的透光率和雾度。研究表明,成型过程中的工艺选择对样件的残余应力影响显著,提高熔体温度和模具温度、增大保压压力和注射速度、缩短保压时间和冷却时间都可以有效降低残余应力;退火温度升高可明显削弱成型过程热力历史的差异,降低残余应力并使之趋于一致,偏差最小为0.71 MPa。热力历史对光学性能的影响与残余应力相关性较大,总体上残余应力降低,透光率升高而雾度降低,可分别达到93.1%和1.1%。The residual stress of polymethyl methacrylate(PMMA)specimens under different thermal-mechanical history of injection molding were quantitatively characterized by the photo-elastic measurement.Transmittance and haze of the specimens were tested simultaneously.The results show that the residual stress is significantly influenced by the selection of processing parameters.The residual stress is decreased with elevating melt temperature and mold temperature,increasing the packing pressure and injection velocity,shortening packing time and cooling time.The difference between thermal-mechanical histories in injection molding can be reduced by increasing annealing temperature.The minimum deviation of residual stress is only0.71MPa.Effects of the thermalmechanical history on transmittance is related to residual stress.With residual stress decreasing,transmittance increase and haze decrease oppositely in general.The transmittance and haze can reach93.1%and1.1%respectively.

关 键 词：热力历史 注射成型 聚甲基丙烯酸甲酯 残余应力 光学性能 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]